如何在C＃中用单个空格替换多个空格？

#1 楼

string sentence = "This is a sentence with multiple    spaces";
RegexOptions options = RegexOptions.None;
Regex regex = new Regex("[ ]{2,}", options);     
sentence = regex.Replace(sentence, " ");

#2 楼

myString = Regex.Replace(myString, @"\s+", " ");

#3 楼

string xyz = "1   2   3   4   5";
xyz = string.Join( " ", xyz.Split( new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries ));

#4 楼

myString = Regex.Replace(myString, @"\s+", " ", RegexOptions.Multiline);

#5 楼

 var list = str.Split(' ').Where(s => !string.IsNullOrWhiteSpace(s));
 str = string.Join(" ", list);

#6 楼

    public static class StringExtension
    {
        public static String ReduceWhitespace(this String value)
        {
            var newString = new StringBuilder();
            bool previousIsWhitespace = false;
            for (int i = 0; i < value.Length; i++)
            {
                if (Char.IsWhiteSpace(value[i]))
                {
                    if (previousIsWhitespace)
                    {
                        continue;
                    }

                    previousIsWhitespace = true;
                }
                else
                {
                    previousIsWhitespace = false;
                }

                newString.Append(value[i]);
            }

            return newString.ToString();
        }
    }

string testValue = "This contains     too          much  whitespace."
testValue = testValue.ReduceWhitespace();
// testValue = "This contains too much whitespace."

#7 楼

while(str.Contains("  ")) str = str.Replace("  ", " ");

#8 楼

myString = Regex.Replace(myString, " {2,}", " ");

#9 楼

    public static string FilterWhiteSpaces(string input)
    {
        if (input == null)
            return string.Empty;

        StringBuilder stringBuilder = new StringBuilder(input.Length);
        for (int i = 0; i < input.Length; i++)
        {
            char c = input[i];
            if (i == 0 || c != ' ' || (c == ' ' && input[i - 1] != ' '))
                stringBuilder.Append(c);
        }
        return stringBuilder.ToString();
    }

#10 楼

string s = "welcome to  london";
s.Replace(" ", "()").Replace(")(", "").Replace("()", " ");

#11 楼

temp = new Regex(" {2,}").Replace(temp, " "); 

Regex singleSpacify = new Regex(" {2,}", RegexOptions.Compiled);
temp = singleSpacify.Replace(temp, " ");

#12 楼

string myString = "   0 1 2  3   4               5  ";
myString = string.Join(" ", myString.Split(new char[] { ' ' }, 
StringSplitOptions.RemoveEmptyEntries));

#13 楼

string s = Regex.Replace (
    "   1  2    4 5", 
    @"[ ]{2,}", 
    " "
    );

static class StringExtensions
{
    public static string Join(this IList<string> value, string separator)
    {
        return string.Join(separator, value.ToArray());
    }
}

//...

string s = "     1  2    4 5".Split (
    " ".ToCharArray(), 
    StringSplitOptions.RemoveEmptyEntries
    ).Join (" ");

#14 楼

public static string Join<T>(this IEnumerable<T> source, string separator)
{
    return string.Join(separator, source.Select(e => e.ToString()).ToArray());
}

//...

string s = "     1  2    4 5".Split (
    " ".ToCharArray(), 
    StringSplitOptions.RemoveEmptyEntries
    ).Join (" ");

#15 楼

// Mysample string
string str ="hi you           are          a demo";

//Split the words based on white sapce
var demo= str .Split(' ').Where(s => !string.IsNullOrWhiteSpace(s));
        
//Join the values back and add a single space in between
str = string.Join(" ", demo);
// output: string str ="hi you are a demo";

#16 楼

pattern: (?m:^ +| +$|( ){2,})
replacement: 

pattern: (?m:^_+|_+$|(_){2,})  <-- don't use this, just for illustration.

#17 楼

public static string MergeSpaces(this string str)
{

    if (str == null)
    {
        return null;
    }
    else
    {
        StringBuilder stringBuilder = new StringBuilder(str.Length);

        int i = 0;
        foreach (char c in str)
        {
            if (c != ' ' || i == 0 || str[i - 1] != ' ')
                stringBuilder.Append(c);
            i++;
        }
        return stringBuilder.ToString();
    }

}

#18 楼

while word.contains("  ")  //double space
   word = word.Replace("  "," "); //replace double space by single space.
word = word.trim(); //to remove single whitespces from start & end.

#19 楼

    [ ]+    #only space

   var text = Regex.Replace(inputString, @"[ ]+", " ");

#20 楼

private string removeNestedWhitespaces(char[] st)
{
    StringBuilder sb = new StringBuilder();
    int indx = 0, length = st.Length;
    while (indx < length)
    {
        sb.Append(st[indx]);
        indx++;
        while (indx < length && st[indx] == ' ')
            indx++;
        if(sb.Length > 1  && sb[0] != ' ')
            sb.Append(' ');
    }
    return sb.ToString();
}

string test = removeNestedWhitespaces("1 2 3  4    5".toCharArray());

#21 楼

public static string FilterWhiteSpaces(string input)
{
    if (input == null)
        return string.Empty;

    var stringBuilder = new StringBuilder(input.Length);
    for (int i = 0; i < input.Length; i++)
    {
        char c = input[i];
        if (i == 0 || !char.IsWhiteSpace(c) || (char.IsWhiteSpace(c) && 
            !char.IsWhiteSpace(strValue[i - 1])))
            stringBuilder.Append(c);
    }
    return stringBuilder.ToString();
}

#22 楼

string oldText = "   1 2  3   4    5     ";
string newText = oldText
                    .Replace("  ", " " + (char)22 )
                    .Replace( (char)22 + " ", "" )
                    .Replace( (char)22 + "", "" );

Assert.That( newText, Is.EqualTo( " 1 2 3 4 5 " ) );

#23 楼

while (myString.IndexOf("  ", StringComparison.CurrentCulture) != -1)
{
    myString = myString.Replace("  ", " ");
}

#24 楼

using System;
using System.Linq;
using System.Text;

public static class StringExtension
{
    public static string StripSpaces(this string s)
    {
        return s.Aggregate(new StringBuilder(), (acc, c) =>
        {
            if (c != ' ' || acc.Length > 0 && acc[acc.Length-1] != ' ')
                acc.Append(c);

            return acc;
        }).ToString();
    }

    public static void Main()
    {
        Console.WriteLine("\"" + StringExtension.StripSpaces("1   Hello       World  2   ") + "\"");
    }
}

"1   Hello       World  2   "

"1 Hello World 2 "